Summer begins on 1 December, and December carries the two biggest fixed public holidays of the year: Christmas Day on 25 December and Boxing Day on 26 December. 10 December 2028 falls inside this 31-day month, at the height of the Australian retail and travel calendar for the year.
A public holiday that falls on a Sunday sits inside the weekend rather than beside it, and whether a substitute day off applies to the following Monday depends on the specific holiday and the state. Sunday 10 December 2028 falls on this day of the week, at the close of the weekend, immediately before the working week resumes.
2028 has 366 days on the calendar. Leap years add a single extra day to February, giving those years 366 days instead of 365 and shifting the day-of-year number for every date from March onward by one compared with an ordinary year. This is the only irregularity in the length of the Australian calendar year.